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Bilbao, Spain

Larena A.B.,Technical University of Madrid | Menendez D.G.,IDOM
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2014

Reciprocal frame structures, formed by a set of self-supported elements in a closed circuit, have long been used since antiquity to cover large spans with small elements. The roof structure of the Euskalduna conference centre and concert hall extension in Bilbao, covering an irregular geometry of 3000 m2 with a maximum span of 45 m, presented an interesting opportunity to revisit the concept and to apply these classical systems. Furthermore, its analysis and development led to an interesting discussion on reciprocal frames. They showed great sensitivity of these systems to the local modification of a particular element, establishment of irregular load paths, mobilisation of almost the entire system when locally applying a punctual load and, finally, its large deformability. Besides, reciprocal frames present particular construction complexities and possibilities due to the moderate length of the structural elements, the predominance of shear-only connections and the necessity of the entire system to be completely erected to guarantee its stability. Euskalduna extension, completed in 2012, is one of the largest and a very particular case of irregular reciprocal frame structures built in the world. It shows the formal possibilities and potentiality of reciprocal frames to respond to free and irregular geometries. © 2014 Publishing Technology. Source

Bontoiu C.,University of Huelva | Martel I.,University of Huelva | Gomez C.,IDOM | Falone A.,TTI
IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference | Year: 2014

LINCE heavy-ion facility [1] makes use of a low-energy ion linac consisting of quarter-wave resonators (QWRs) designed for β = 0.045, 0.077 and 0.15 working at 72.75 MHz and 109.125 MHz, and solenoid magnets distributed along four different cryomodules. Particle tracking studies have been performed using realistic electric and magnetic field maps to reach the final energy of 8.5 MeV/u for A/Q = 7 ions. Copyright © 2014 CC-BY-3.0 and by the respective authors. Source

Bilbao A.,IDOM | Bilbao A.,Advanced Design and Analysis Group | Aviles R.,Escuela Tecnica Superior de Ingenieria | Aguirrebeitia J.,Escuela Tecnica Superior de Ingenieria | Bustos I.F.,Escuela Tecnica Superior de Ingenieria
AIAA Journal | Year: 2011

Vibratory dynamics of variable geometry trusses (VGT) is studied and a tool is developed to efficiently estimate the dynamic properties of VGTs throughout their movement. A procedure for estimating the variation of natural frequencies and vibration modes of VGTs during their movement, making it unnecessary to recalculate them at all positions but just for a small number thereof, is presented. To calculate the derivatives of modes and frequencies, the stiffness matrix derivatives are calculated with respect to the nodal coordinates. To model the variations of frequencies and modes throughout VGT evolution, linear estimation is used, which obtains natural frequencies and vibration modes in a new position from their values in a previous position. The derivatives of the natural frequencies and vibration modes are calculated in relation to the nodal coordinates for a reference position. Source

Mendikoa I.,University of the Basque Country | Sanchez-Lavega A.,University of the Basque Country | Perez-Hoyos S.,University of the Basque Country | Hueso R.,University of the Basque Country | And 6 more authors.
Publications of the Astronomical Society of the Pacific | Year: 2016

We present PlanetCam UPV/EHU, an astronomical camera designed fundamentally for high-resolution imaging of Solar System planets using the "lucky imaging" technique. The camera observes in a wavelength range from 380 nm to 1.7 μm and the driving science themes are atmosphere dynamics and vertical cloud structure of Solar System planets. The design comprises two configurations that include one channel (visible wavelengths) or two combined channels (visible and short wave infrared) working simultaneously at selected wavelengths by means of a dichroic beam splitter. In this paper the camera components for the two configurations are described, as well as camera performance and the different tests done for the precise characterization of its radiometric and astrometric capabilities at high spatial resolution. Finally, some images of solar system objects are presented as well as photometric results and different scientific cases on astronomical targets. © 2016. The Astronomical Society of the Pacific. All rights reserved. Source

Vallory J.,Fusion for Energy F4E | Panayotov D.,Fusion for Energy F4E | Zmitko M.,Fusion for Energy F4E | Poitevin Y.,Fusion for Energy F4E | And 3 more authors.
Fusion Engineering and Design | Year: 2016

Europe is developing two reference tritium breeder blanket concepts that will be tested in ITER under the form of Test Blanket Modules (TBMs): the helium-cooled lithium-lead (HCLL) which uses the liquid Pb-16Li as both breeder and neutron multiplier and the helium-cooled pebble-bed (HCPB) with lithiated ceramic pebbles as breeder and beryllium pebbles as neutron multiplier. Both concepts are using the EUROFER reduced activation ferritic-martensitic steel as structural material and pressurized helium technology for heat extraction. In view of the conceptual design review, design activities of the TBM sets have been focused on specific areas. The convergence of TBMs design, developed in their pre-conceptual phase by different European Fusion laboratories, has been sought in order to optimize fabrication and maintenance in ITER port #16. The structural strength of the helium back manifold of both TBMs is now based on the HCLL stiffening rod concept proposed in 2010. Through iterations between the nuclear analyses and design, the radiation shield design reaches a good compromise between its shielding performances versus manufacturing. A shield-to-TBM attachment has been implemented which complies with constraints related to thermal expansion under operating conditions and mechanical strength to handle dynamic loads such as major disruptions and seismic event. A full set of thermomechanical, hydraulic and structural analysis of the TBM sets has been carried out. They cover the loads selected as design drivers in the conceptual phase along with exploration of operational domain in terms of helium cooling conditions versus RCC-MRx code criteria compliance. The analysis results show that thermal loads are the main design driver for most of TBM sub-components. Pressure loads are also a design driver for the TBM stiffening grids under in-TBM loss of coolant accident. From the analyses carried out for the shields, the most demanding scenario has been demonstrated to be the baking mode. For these internal pressure loads, the capacity checks carried out have demonstrated the feasibility and potential of the shield design proposed. © 2016 Elsevier B.V. Source

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